This document discusses the difference between the French words "bon" and "bien". Bon is usually an adjective that modifies nouns and means "good". Bien is usually an adverb that modifies verbs and means "well". Some examples are provided to illustrate bon is used for nouns like "bonne soirée" for good evening, while bien is used for verbs and expressions like "aller bien" to be well.

1. Bon ou bien ?
Bon is (usually) an adjective (modifies a noun)
It means ‘good’, or (depending on the context) it can mean ‘correct’, ‘useful’,
‘suitable’, etc.
Bien is (usually) an adverb (modifies a verb / “doing word”)
It means ‘well’, or (depending on the context) it can be used to add emphasis.

2. Bon ou bien ?
Bon
Bonne soirée - good evening
Une bonne idée - a good idea
Bonne chance - good luck
Un bon livre - a good book
Bien
Très bien - very good
Aller bien - to be well (lit. to be ‘going’ well, e.g. je vais bien, ça va bien?)
Bien dormir - to sleep well
J’ai bien dit - I did say it